These serial killer mysteries will creep you out! Welcome to WatchMojo, and today we’re counting down our picks for the most unnerving and unsolved questions involving famous murder cases. Our countdown of the creepiest serial killer mysteries includes What Is Ted Bundy’s Actual Kill Count?, Who Filled the Janikhel Grave?, Did Jack the Ripper Write the From Hell Letter?, and more! What are your theories on these mysteries? Let us know in the comments below!

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